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    <title>Document</title>
    <link rel="stylesheet" href="./css/app.css">
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    <h2>路径</h2>
    <!-- 
        网页中的路径
        相对路径
            * ./css/app.css
            * ../js/app.js
            * image/logo.png  => ./image/logo.png
            > 相对路径的参照物, 是当前网页的 URL 最后一个路径所在的目录

        绝对路径
            * http://127.0.0.1:8000/image/logo.png
            * /image/logo.png
            * //miaosha.jd.com/specialpricelist.html  

        网页URL的情况
            * a 标签
            * img video audio iframe标签
            * form
            * ajax   xhr.open('get', URL);


        http://atguigu.com/a/b/c
            <img  src="./c/1.jpg" />       =>   http://atguigu.com/a/b/c/1.jpg
            
            
     -->
     <script src="/js/app.js"></script>
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